14 C.F.R. § 25.1149 Propeller speed and pitch controls.
Title 14 - Aeronautics and Space
(a) There must be a separate propeller speed and pitch control for each propeller. (b) The controls must be grouped and arranged to allow— (1) Separate control of each propeller; and (2) Simultaneous control of all propellers. (c) The controls must allow synchronization of all propellers. (d) The propeller speed and pitch controls must be to the right of, and at least one inch below, the pilot's throttle controls.
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart E—Powerplant
Powerplant Controls and Accessories
§ 25.1149 Propeller speed and pitch controls.
